Thomas e



' 2 Sheets-Sheet I.

Pate'ntedlune 10, 1873.

T. E. McNElLL.

AM mam- ITHOGRAPHIC m m: (osanms mncsss) Sectional Steam-Bmlers Fla 2 .UNITED STATES THOMAS E. MONEILL,

or New YORK, ay. it

IMPROVEMENT IN SECTIONAL STEAM-BQ ILERSL To all whom it may concern.-

Be it known that I, THOMAS E. MoNEILL, of the city, county, and State of New York, have invented an Improved Sectional Steam- Boiler, of which the following is a specification:

My invention consists of a sectional steamboiler, too fully described hereafter to need preliminary description, the main object of t my invention being to obtain a thorough circulation of the water in the boiler, a rapid generation of steam without risk of burning out the tubes, and such a disposal of the parts as to obtain an extended heating-surface and y, p a thorough absorption of the heat of the furnace.

1n the accompanying drawing, Figure 1, Sheet 1, is avertical section of my improved steam -boiler; Fig. 2, a planview of the same, one-half being a section on the line 1 2, Fig. 1; Fig. 3, Sheet 2, a front elevation, partly in section, on the lines 3 4, Fig. 2; Fig. 4, arear view,*partly in section; and,jFigs. 5 and 6, detached viewsdrawn to an enlarged scale.

The boiler rests upon and is, with the exception of the end section, contained within a furnace, of which a is the base; b, the front wall; 0, the grate-bars; d, the bridge-wall; d, a pipe for supplying air; 0 e, the double side walls j', the root; and g the outlet for the products of combustion.

The end sections of the boiler and filling pieces between same close the furnace at the front and back of the same, as will be more fully described hereafter; and the products of combustion, in their upward passage from the fire-place to the chimney, are compelled by partitionsh, secured to'the tubes of the boiler, to take the circuitous course, indicated by the arrows in Fig. 1, around and along the said tubes. v i The boiler, or that portion of the same immediately over the fire-place, consists of two sets of inclined wrought-iron tubes of different diameters, one set being arranged directly above the other, and the tubes A of the lower set being of greater diameter than the upper tubes B; and, in fact, of somewhat greater capacity than the tubes commonly used in boilers of this class. The tubes A are not arranged one directly above the other, but are Specification forming part of Letters Patent No. 139,724, dated June 10, 1873; application filed March 30, 1872.

staggered in the manner. plainlyshownin r v Figs. 3 and 4; and the said tubes are closed furnace. The drum F communicates-through an inclined pipe, G, of small diameter, with a similar horizontal drum, H, placed at a lower level than the said drum F, at the rear of the furnace and'directly beneath} thecaps D of the lower boiler -'tuhes A. Each of the said caps D is composed of two flanged sections,i

and i, Fig. 5, the former of which is screwed on to the end of its tube, and secured to the latter section by boltspassing through the flanges. The said caps rest one upon the other, and the whole, with the rear ends of the tubes, are supported by abeannl, which is,

in turn, supported by thedrum H, the said beam, with the caps and filling pieces introduced between the .latter,forming therear wall of the furnace. The drum H communi cat's freely with each ot' the boiler-tubes A 1 17 through a series of vertical wrought-ironpipes, J, of small diaineter,Figs. 1, 4, and 5, which i j extend upward from the said drum, and are screwed into tubular projections 1;? formed on 1 each of the caps D.

The staggeringof theboiler-tubes, mama seqnently, of the caps, enahlesthis connec-; tion to be readily madeiwithout attaching to many tubes to one pipe J, and withoutbring y 3 in g the connection too i closely, together, the 1 object of which will be rendered apparent here after.

Each boiler-tube A is divided longitudinal-f p 1y by a partition, j, slipped intothe same, and extending almost or quitefrom one end tothe i other. (See Figs. 1, 5, and 6.)

The small boiler-tubes B of the upper series are; in the present instance, arranged in four parallel rows, indicated by the lettersB,B B and B The tubes B and B are connected togetherat their front ends by couplings k, which restupon the tubes B and the latterand thetuhes B are connected by similar couplings k','which,

rted by the uppermost their couplings It into the lower compartment m of the said drum M, and thence through the of the tubes B, 13 ,15 and inclined pipes l? and G to the drums]? and rises in the pipes E E t their rear ends, with d M, one directly from the latter the water (1 partly bythe and J by which the main boiler-tubes A are lls of the furnace and partly by the tilled fromboth ends. Thelarge pipes E,howto fill the tubes A, the

of the tubes A The drum L 18 diever, are relied upon do two smaller pipes J being merely supplementary )y a longitudinal partition 11 ompartments, l and l, and the drum M feeders, arranged to supply the tubes at their arly divided into compartments m an lower ends, and thus prevent the emptying Je compartments L and l communicate and burning out of the same owing to t e ich other through the tubes B and B rapid generation of steam. The partitions j air couplings k, the compartments L and in each of the said tubes A also induce a reugh a short coupling-pipe, n, at one en turn circulation an aid in preventing the wadrum, and the compartments m and m ter from being forced out of the same when ;h the tubes B and B and their coupsteam is rapidly generated, for when the water To. (See Fig. 1.) Communication is in the lower portion 0' one o the tubes be ed, it will with the lished between the lower compartment neath the par the drum and the drums F and at r of the boiler through a long l diameter, extending ipes E, -e directly from the drum h or circulation in the said I d communicating with t e tit-ion j, as indicated by the arrows in r through the same coupling 1), (Fig. 3,) This return circulation from the tube and pipe il'llch connection is made with the pipe G E, with the water which is continually entering to the drum The vertical pipes ing the lower end of the said tube from its 1 which all of the boiler-tubes A communipipe J, will effectually prevent the forcing out f the peculiar of the water and the consequent burning of at their front ends, are 0 pc best observed in Fi nd 3 each the tube, for the more rapid the generation 0 t the front steam, and the greater the tendency to drive the more rapid will be this cir- ;urn, suppo The whole municate, a isverse drums, L an e other, and supporte iig cast with a smaller pipe, E, a iinunicating withthe drum F at the hot the water out, n and with the pipe E at the top, for the culation, and the greater the quantity of water the circulation, as heresupplied y the supplementary feeder J. communicating w' h a watersuprpose of facilitatin,

er described. The said pipes E are also cast Pipes th hollow projections w a t ply, are es own in Fig. 3, so that each may receive a lating pipe nsiderable number of the tubes A, each ends of inclined boiler-tubes, and merely connecting the same, inasmuch as in the latter re said pipes being arranged, in the present f the verticase the rapid generation of steam will drive s effectually as if sentially different from the circus hitherto arranged at the lower .stance, for attachment to three 0 il rows of staggered tubes. A steam-drum, the water from t is secured to the flanged upper end of each the connecting-pipes were not employed.

There will be an upward circulation in the the lat if the pipes E, and has suspended within it,

y meansof a rod, q, one or more eoncavo-coni es E of the heated water enterin ex perforated plates, 0*, through which the ter from the several tubes A, and a return circulation from the said pipes through the ;team as it rises upward is caused to pass in Jrder to separate the water from the same, and pipes E to the drum Efrem which the water thus prevent priming. he ,whole of these will again rise into the pipes E. The hot tubes water from the drum F, however, will not pass H, and thus drums communicate through connecting rier, B, through the pipe G to the drum hove-described circulation \Yltll it single transverse drum or K i' 1 8 0W1 Which interfere with the a l I l as the connection with the l t 1111 cost for the whole number of tubes of both series will not be greater than that of an uniform set of ordinary size. Owing to the tubes at the bottom of the boiler being of such large diameter, the conversion of the entire body of water therein into steam, and the consequent burning of the tubes, which frequently ensues when small tubes are employed, cannot take place, while the smaller tubes at the top of the boiler where the gases are not so hot as nearer the fire present a larger heating-surface in proportion to the water they contain,

which, therefore, is more rapidly heated than boiler at their front ends, they can contract and expand freely, but any movement caused by the contraction or expansion of the lower tubes A must take place at their rear ends. Such movement is permitted by the caps D, which can slide freely one over the other, and by the supplementary feed-pipes J, which, being of wrought-iron of small diameter, and being connected to the caps at comparatively long intervals, owing to the staggering of the tubes, have sufficient elasticityto yield to the movements caused by contraction and expansion. It will be seen that pipes J, connected to a stationary part of the boiler only at their lower ends, and to the lowest set of tubes at some distance above these stationary ends, will yield freely throughout their length, while in boilers in which rear connecting-pipes have hitherto been used such pipes have been so secured at both ends to stationary parts of the boiler as to be incapable of accommodating themselves to the movements of any but the central tubes.

I claim as my invention- 1. A sectional boiler consisting of twosets of communicating tubes, one above the other,

and the lower being of larger diameter than the upper, all substantially as specified.

2. The combination, substantially as described, of the partitioned drums L and M with the upper tubes B of the boiler.

3. The combination, substantially as de-' scribed, of the upper tubes B, and their conheating-drums, forming a feed-water heater, with the distributing-drum F.

4. The combination, with the tubes A, of feed-pipes E, communicating with the upper ends ofthe said tubes, and ofsupplemental feedpipes J, of smaller diameter than the pipes E,

communicating with the lower ends of the said tubes, all substantially as and for the purpose specified.

5. The combination, with the said tubes A, of yielding or elastic feed-pipes J, substantially as described.

6. The combination, with the tubes A and pipes J, of caps D, cast in two sections, adapted to each other and to the said tubes and pipes, substantially as described. I

7. The combination of the tubes A, connecting-pipes J, and drum H communicating with the pipes J, substantially as described. 8. The pipes E, each cast in one piece, with a return-pipe, E, of smaller diameter.

9. The combination of the drum-section F with the pipe E and return-pipe E, substantially as and for the purpose described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THOS. E. MCNEILL. Witnesses:

I. G. WINANS, ISAAC D. POLLARD. 

